142 struct n_hdlc {  struct
166 static struct n_hdlc *n_hdlc_alloc (void);  argument
193 #define tty2n_hdlc(tty)	((struct n_hdlc *) ((tty)->disc_data))
194 #define n_hdlc2tty(n_hdlc)	((n_hdlc)->tty)  argument
198 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_rx_queue()  local
201 	while ((buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list)))  in flush_rx_queue()
202 		n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, buf);  in flush_rx_queue()
207 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_tx_queue()  local
210 	while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))  in flush_tx_queue()
211 		n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);  in flush_tx_queue()
233 static void n_hdlc_release(struct n_hdlc *n_hdlc)  in n_hdlc_release()  argument
235 	struct tty_struct *tty = n_hdlc2tty (n_hdlc);  in n_hdlc_release()
245 	if (tty->disc_data == n_hdlc)  in n_hdlc_release()
250 		buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);  in n_hdlc_release()
257 		buf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);  in n_hdlc_release()
264 		buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);  in n_hdlc_release()
271 		buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_release()
277 	kfree(n_hdlc);  in n_hdlc_release()
290 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_close()  local
295 	if (n_hdlc != NULL) {  in n_hdlc_tty_close()
296 		if (n_hdlc->magic != HDLC_MAGIC) {  in n_hdlc_tty_close()
304 		if (tty == n_hdlc->backup_tty)  in n_hdlc_tty_close()
305 			n_hdlc->backup_tty = NULL;  in n_hdlc_tty_close()
306 		if (tty != n_hdlc->tty)  in n_hdlc_tty_close()
308 		if (n_hdlc->backup_tty) {  in n_hdlc_tty_close()
309 			n_hdlc->tty = n_hdlc->backup_tty;  in n_hdlc_tty_close()
311 			n_hdlc_release (n_hdlc);  in n_hdlc_tty_close()
328 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_open()  local
336 	if (n_hdlc) {  in n_hdlc_tty_open()
341 	n_hdlc = n_hdlc_alloc();  in n_hdlc_tty_open()
342 	if (!n_hdlc) {  in n_hdlc_tty_open()
347 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
348 	n_hdlc->tty    = tty;  in n_hdlc_tty_open()
375 static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
385  	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
386 	if (n_hdlc->tbusy) {  in n_hdlc_send_frames()
387 		n_hdlc->woke_up = 1;  in n_hdlc_send_frames()
388  		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
391 	n_hdlc->tbusy = 1;  in n_hdlc_send_frames()
392 	n_hdlc->woke_up = 0;  in n_hdlc_send_frames()
393 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
395 	tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
407 			n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);  in n_hdlc_send_frames()
421 			n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, tbuf);  in n_hdlc_send_frames()
427 			tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
437 			n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);  in n_hdlc_send_frames()
446 	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
447 	n_hdlc->tbusy = 0;  in n_hdlc_send_frames()
448 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);   in n_hdlc_send_frames()
450         if (n_hdlc->woke_up)  in n_hdlc_send_frames()
466 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_wakeup()  local
471 	if (!n_hdlc)  in n_hdlc_tty_wakeup()
474 	if (tty != n_hdlc->tty) {  in n_hdlc_tty_wakeup()
479 	n_hdlc_send_frames (n_hdlc, tty);  in n_hdlc_tty_wakeup()
496 	register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_receive()  local
504 	if (!n_hdlc || tty != n_hdlc->tty)  in n_hdlc_tty_receive()
508 	if (n_hdlc->magic != HDLC_MAGIC) {  in n_hdlc_tty_receive()
522 	buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);  in n_hdlc_tty_receive()
526 		if (n_hdlc->rx_buf_list.count < MAX_RX_BUF_COUNT)  in n_hdlc_tty_receive()
542 	n_hdlc_buf_put(&n_hdlc->rx_buf_list, buf);  in n_hdlc_tty_receive()
546 	if (n_hdlc->tty->fasync != NULL)  in n_hdlc_tty_receive()
547 		kill_fasync (&n_hdlc->tty->fasync, SIGIO, POLL_IN);  in n_hdlc_tty_receive()
563 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_read()  local
572 	if (!n_hdlc)  in n_hdlc_tty_read()
594 		rbuf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);  in n_hdlc_tty_read()
607 			if (n_hdlc->rx_free_buf_list.count >  in n_hdlc_tty_read()
611 				n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, rbuf);  in n_hdlc_tty_read()
648 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()  local
658 	if (!n_hdlc)  in n_hdlc_tty_write()
661 	if (n_hdlc->magic != HDLC_MAGIC)  in n_hdlc_tty_write()
679 		tbuf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);  in n_hdlc_tty_write()
689 		n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
690 		if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC ||   in n_hdlc_tty_write()
691 		    tty != n_hdlc->tty) {  in n_hdlc_tty_write()
692 			printk("n_hdlc_tty_write: %p invalid after wait!\n", n_hdlc);  in n_hdlc_tty_write()
712 		n_hdlc_buf_put(&n_hdlc->tx_buf_list,tbuf);  in n_hdlc_tty_write()
713 		n_hdlc_send_frames(n_hdlc,tty);  in n_hdlc_tty_write()
732 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_ioctl()  local
743 	if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC)  in n_hdlc_tty_ioctl()
750 		spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
751 		buf = list_first_entry_or_null(&n_hdlc->rx_buf_list.list,  in n_hdlc_tty_ioctl()
757 		spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
765 		spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
766 		buf = list_first_entry_or_null(&n_hdlc->tx_buf_list.list,  in n_hdlc_tty_ioctl()
770 		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
803 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_poll()  local
809 	if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {  in n_hdlc_tty_poll()
817 		if (!list_empty(&n_hdlc->rx_buf_list.list))  in n_hdlc_tty_poll()
824 				!list_empty(&n_hdlc->tx_free_buf_list.list))  in n_hdlc_tty_poll()
835 static struct n_hdlc *n_hdlc_alloc(void)  in n_hdlc_alloc()
839 	struct n_hdlc *n_hdlc = kzalloc(sizeof(*n_hdlc), GFP_KERNEL);  in n_hdlc_alloc()  local
841 	if (!n_hdlc)  in n_hdlc_alloc()
844 	spin_lock_init(&n_hdlc->rx_free_buf_list.spinlock);  in n_hdlc_alloc()
845 	spin_lock_init(&n_hdlc->tx_free_buf_list.spinlock);  in n_hdlc_alloc()
846 	spin_lock_init(&n_hdlc->rx_buf_list.spinlock);  in n_hdlc_alloc()
847 	spin_lock_init(&n_hdlc->tx_buf_list.spinlock);  in n_hdlc_alloc()
849 	INIT_LIST_HEAD(&n_hdlc->rx_free_buf_list.list);  in n_hdlc_alloc()
850 	INIT_LIST_HEAD(&n_hdlc->tx_free_buf_list.list);  in n_hdlc_alloc()
851 	INIT_LIST_HEAD(&n_hdlc->rx_buf_list.list);  in n_hdlc_alloc()
852 	INIT_LIST_HEAD(&n_hdlc->tx_buf_list.list);  in n_hdlc_alloc()
858 			n_hdlc_buf_put(&n_hdlc->rx_free_buf_list,buf);  in n_hdlc_alloc()
867 			n_hdlc_buf_put(&n_hdlc->tx_free_buf_list,buf);  in n_hdlc_alloc()
873 	n_hdlc->magic  = HDLC_MAGIC;  in n_hdlc_alloc()
874 	n_hdlc->flags  = 0;  in n_hdlc_alloc()
876 	return n_hdlc;  in n_hdlc_alloc()